Rotary compressor.



Cf F. HETTINGER,

ROTARY COMPRESSOR.

APPLICATiON FILED JAN. 6. i914.

L v Patented Apr. 27, 1915.

dille? i voir"rito,i

RGTARY speiaeacon if .application nled Jennery S To (ill `wie om, it' may concern s lle it known that l, CARL El. Hnfr'rriionni, a citizen ol the `United States, residing in Boston, in the county of Suffolk epd State of iiassacliusetts, have invented an improvement in Rotary Compressors, of which the following description, in connection With the accompanying drawings, ,is a specifica tion`r like cliaracters on the drawings representing like parts.

'lfliis invention relates to a rotary compressor especially vdesigned and adaptedamong other usesg to he employed in refrigerati'ugf apparatus for compressing the gas cous ret'rigjerent used therein., which may he ammonia, carbon dioxid, sulfur dioxid or other suitable gras or vapor.

The present invention has for its object 'to provide a simple., ellicient and inexpensive rotary compressor, especially adapted for the purj'iose specified. To this end, the rotary compressor is preferably made as herein shown and is provided with a cylindrical casing having a fluid inlet at one end and a fluid outlet at its opposite end, and-containingr within it a rotor7 comprising a conical center member or body portion and a helical coi'npressing niemloer or worm, of a diameter equal to the internal diameter oi the cylindriral casing' to malte contact therewith, and which coiji yrates with the center or loody portion ot' the rotor to form a helical passaggi; which extends from the Huid inlet to the fluid outlet ol. the c sinf,r and is of greatest holding capacity or size, at the inlet end oi' the casing, and decreases in size toward the outlet end of said casing, so that in the rotation oi the rotor, a substantially large volume ol! gas admitted into the casing at one end thcreoij may he 'forced toward the opposite or outlet end thereof and :he sithjcctcd to an increasing' pressure. to compress the salue. Provision is made lo' ahsorhinoJ thc heat generated as the gas is compressed, which may be elccted as herein shown by providing the cylindrii'zal casing with a u'aterjacliet through which water or other cooling` medium is'icireulated. The Huid-cub let port may be controlled by an automatic valve as will he described. These and other features oi this invention will he pointed out. in the claims at the end oi? this specification. 4

'.llie drawing represents in section'and ele ration` one 'form ofi compressor embodying this invention.`

, une. seriali no. mosca.

shown, (i represents a cylindrical casing,`

which; is provided at its opposite ends with heads o, c, which are secured fluid tight to said casing' by bolts d or otherwise,

.lhe casing' i contains within it a rotor, which i'a'in'iprises in 4the present instance a. conical center member or body portion l0, having extended from its opposite ends journais l2f 13, constituting the shaft `for the rotor, and a helical compressing member or worm ifiattached to or Yforming part of the center member l03 and of a diameter-'equal to the internal diameter of the casin 1, so as to form with the latter and the conical cem ter member, a closed helical passage l5, which extends in the direction of the length of the rotor from one end of the cylinder to the other, and which decreases in size or capacity from the inlet to the outlet end of the casing.

In the present instance, the apex of the conical center member l() is located adjacent to the head o the casing5 and said head has attached to it one or more Vfluid inlet pipes l?, and in the liresent instance two such pipes are shown, each of which is provided with a hand operated valve 18 and with a che valve 1.9.

The oase the conical center member l() is located adjacent to the cylinder head c Awhich provided with one or more fluid outlet ports 20., herein shown as two in numbei' and cach normally closed by an auto matically operated valve 2l, having its'steui` Q2 encircled hy a spring' 22:5, between a sta tionary disk 2i and the said valve. sThe disk shown as located in a hollow boss 25 on the cylinder head c, and said' boss is provided with a removable ea p S26 andwith an outlet pipe 27. The stem of the valve 2l is provided with a nut 255 to avoid injury to the valve when the latter closed hy its spring' The shaft 12v. i3 o'l the rotor eX- tends through the Cylimler heads and. through suitable stulline boxes 30, secured t0 or forming part ol said heads and containing suitable packing material lh hy which leakage ol gas out oli' the cylinder along the shaft is prevented or reduced to a minimum` The shaft l2, 13 of the rotor may herotated in any suitaole or well known manneny and it `is deemed unnecessary to illustrate the driving finechanisiu for the rotor, as said mechanism constitutes no part of the present invention.

Fili

The gas inletfpipes 17 are designed to be connected with the source of supply for the gas in an expanded condition, such for instance Vas the expansion coil or chamber of a refrigeratingsystem, and said gas is drawn into the casing of the compressor by the rotor. The etpanded gas is "forced in the direction of the length of the rotor through the helical passage to the outlet end 'of the casing, and as the passage 15 decreases in area or size, the gas is compressed and materially diminished in volume bythe helical compressing member 14.0 The compressed gas *passes through the outlet port or ports 2O into the hollow bosses 25, and `out therefrom through the pipes 27, which may lead to a condenser of known construction and not herein shown.

The heat generated by the compression of' tbc gas on its passageqthrough the compressor is absorbed by a. cooling medium, such as water, 34, which is circulated through a jacket 35 enveloping the cylindrical casing u and provided with an inlet pipe 86 at one end and with an outlet pipe 3T at the otherend.

lt will be observed that in the rotor herein shown, the gas is forced in the direction of the length of the rotor through a helical passage which decreases in size from the gas 'inlet to the gas outlet of the compressor,

and while l have shown a preferred construction of rotary compressor for accomplishibg this result, it is not desired to limit the inventiom'to the particular construction shown. Furthermore the size ofthe helical passage may be varied according to the particular degree of compression it isdesired compressing member attached to said centermember to revolve therewith and coperating with the latter and the said casing to form helical passage, which'decrcases 1n size from the fluid inlet end of the saidvcasing tothe fluid outlet end thereof, said heli- Acal cou'iprcssing member making a substan- I tially fluid-tight fit with said casing, substantially as described.

2. In a rotary compressor, in combination, a" casing provided at one end with a fluid inlet and at its other end with a fluid outlet, and having means for cooling it, of a rotor located within the casing and separate therefrom and comprising a conical center member and a helitl compressi'n member attached. to said center member an coperating with the latter and said casing to form a helical passage which decreasesthe fluid inlet to the fluid outlet of said casing, said rotor making a substantially fluidtight fit with said casing.

' 4. In a rotary compressor, in combination, a casing provided with a fluid inlet and with` a fluid outlet, and a rotor rotatable withi said casin and making a substantially uid-tight t with said casing, one of sa'idparts having a helical passage extended in the direction of the length of the rotor and of a size which decreases from lthe fluid inlet to the fluid outlet of said casmg.

5. ln a rotary compressor, in combination, a casing providedv with a duid inlety and with a Huid outlet, and a rotor rotatable in said casing and comprising a conical center member and a helical compressing member which makes a substantial-ly fluid-tight fit with said casing, said rotor being located in the said casin with the apex of the center member a jacent vthe l fluid inlet of the casing, substantially as described. ,Y

6.' In a rotary compressor, in combination, a casing provided with a fluid inlet means external to said casing forv cooling the same.

In testimony whereof, I have signed lmy, name/to this specification in the presence of two subscribing witnesses. l

p CARL F. HETTINGER. 

